<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <input type="text" name="" id="test">
    <script>
        function ajax(content) {
            console.log('ajax request' + content)
        }
        let timer = null;
        let ipt = document.getElementById('test');
        ipt.addEventListener('keyup', function(e) {

            clearTimeout(timer)
        })

        function debounce(fun, delay) {
            return function(args) {
                let that = this;
                let _args = args;
                clearTimeout(fun.id)
            }
        }

        

    </script>
</body>
</html>